1. You must already know that for RAC instance, both
password files on both nodes should be identical except the name eg:orapworcl1
and orapworcl2.

They can be copied from 1 instance to the other, then rename
the name to match the SID used on that node.

2. From 11g onwards, due to strong password authentication,
when creating physical standby database, no matter it is single or RAC,
password file needs to be physically copied from either of the primary
instance, then renamed to match the SID for physical standby, eg: